XL] GIXKGOITES 23 



specifically distinct from G. digitata. G. digitata is represented in 

 Upper Jurassic or Wealden beds in Alaska (Cape Lisburne) 1 . 



Other Localities. 



From Southern Eussia Thomas 2 has recently described good 

 specimens of Gink-go digitata of Middle Jurassic age some of which 

 agree closely with the large leaves figured by Fontaine from Oregon 

 as G. Huttoni var. magnifolia ; the specimens previously figured by 

 Eichwald 3 as Cydopteris incisa from the same district are examples 

 of G. digitata. The species is recorded also from Jurassic rocks 

 in Turkestan 4 (fig. 635, F), Chinese Dzungaria 5 on the west border 

 of Mongolia, from the region to the east of Lake Baikal 6 , and from 

 Afghanistan 7 . The incomplete specimen figured by Feistmantel 8 

 from*the Jabalpur group oi India as Ginkgo lobata, part of which 

 is shown in fig. 643, A, agrees in the form of the lamina and in 

 venation with G. digitata : the veins in the middle of the lamina 

 are from -8 to -1 mm. apart. Feistmantel compares his species 

 with G. digitata, and an examination of one of his figured specimens 

 leads me to assign it to that type ; it is indistinguishable from the 

 Afghan specimen already quoted. The piece of a leaf figured by 

 Feistmantel as Ginkgo sp. belongs to a similar leaf, but the venation 

 is finer and it may be identical with Ginkgo crassipes Feist. 9 



Leaves of the G. digitata type are recorded from Jurassic beds 

 in Victoria 10 (fig. 635, D) and from Japan 11 (fig. 635, C). Tuzson 

 as figured a bilobed petiolate leaf from Jurassic rocks in Hungary 



Ginkgo parvifolia 12 ; it is similar in form to most of the specimens 

 f erred to G. digitata, 'but has relatively broader segments: it is 

 interesting as being the first recorded example of Ginkgoites from 

 Hungary. 



1 Knowlton (14) PI. XLIV. 



- Thomas, H. H. (11) p. 73, PL iv. fig. 7; PI. vra. fig. 2. 



3 Eichwald (65) PI. iv. fig. 6. 4 Seward (07 2 ) PL vn. 



5 Seward (11) PL in. fig. 40. 6 Krasser (05) PL n. fig. 3. 



7 Seward (12) PL iv. fig. 51. 



8 Feistmantel (77 4 ) PL I. fig. 1. 



9 See page 28. la Seward (04 2 ) B. fig. 35. 



11 Yokoyama (88) B. PL xm, fig. 2. 12 Tuzson (14) PL xiv. fig. 1. 



in 







